Clinical utility of the 2-line high-intensity focused ultrasound for skin tightening in Republic of Korea: retrospective clinical study

Sang Hun Kim,Seo Koo Lee,Han Gyu Cha,Eun Soo Park 대한의학레이저학회 2023 MEDICAL LASERS Vol.12 No.1

Background: High-intensity focused ultrasound (HIFU) is a widely used procedure for skin rejuvenation because it targets only the superficial musculoaponeurotic system layer with coagulated thermal energy. However, its long procedure time is inconvenient for both the patient and the operator. The purpose of this study was to investigate the clinical effects of 2-line HIFU.Methods: Between August 2021 and September 2022, patients with sagging and loose facial skin were treated with a 2-line HIFU (10thera®) following the manufacturer’s recommended protocol. We evaluated patients using an automatic skin diagnosis system at the pretreatment stage and about three months after treatment.Results: All patients were treated using the 2-line HIFU. Five patients were lost to follow-up. The median procedure time was 14 minutes. The mean skin grade was 17 at pretreatment and 14 at posttreatment, showing a significant (p < 0.01) difference between the two.Conclusion: This study suggests that the 2-line HIFU can improve wrinkling and sagging of an aging face. It is believed that the shortened treatment time would improve the satisfaction levels of both the operator and the patient.

Synthesis of Magnetite Nano-Particles and Powder Activated Carbon as a Novel Material for Water Treatment

Seo, Gyu Tae,Kim, Jin Tae,Kim, Sung Su,Kaewsuk, Jutamas Trans Tech Publications, Ltd. 2009 Materials science forum Vol.620 No.-

<P>The objective of this study is to develop a novel powder activated carbon (PAC) by surface modification with magnetite nano-particles for enhanced removal of NOM in water. The PAC used for experiment was two types, SAC (wood-based) and MAC (coal-based). First the PAC was treated by heat at 650 or 900 °C for 1hr under N2. And then the PAC surface was synthesized with magnetite nano-particles at the same condition. Adsorption tests of NOM were carried out to identify functional characteristics of the surface modified. Despite reduced surface area, adsorption capacity of the surface modified PAC was comparable to the virgin one. However much increased adsorption capacity was obtained by heat treatment of the PACs. SEC and SUVA254 results showed no specific selectivity in removal of NOM by the modification of PAC surface characteristics. Enhanced oxidation of the NOM was also observed by the magnetite nano-particle synthetic PACs in contact with ozone. Conclusively the surface modification of the PAC has high potential as a novel adsorption material for advanced water treatment.</P>

A Study on Grain Yield Response and Limitations of CERES-Barley Model According to Soil Types

Sang, Wan-Gyu,Kim, Jun-Hwan,Shin, Pyeong,Cho, Hyeoun-Suk,Seo, Myung-Chul,Lee, Geon-Hwi 한국토양비료학회 2017 한국토양비료학회지 Vol.50 No.6

Crop simulation models are valuable tools for estimating crop yield, environmental factors and management practices. The objective of this study was to evaluate the effect of soil types on barley productivity using CERES (Crop Environment REsource Synthesis)-barley, cropping system model. So the behavior of the model under various soil types and climatic conditions was evaluated. The results of the sensitivity analysis in temperature, $CO_2$, and precipitation showed that soil types had a direct impact on the simulated yield of CERES-barley model. We found that barley yield in clay soils would be more sensitive to precipitation and $CO_2$ in comparison with temperature. And the model showed limited accuracy in simulating water and nitrogen stress index for soil types. In general, the barley grown on clay soils were less sensitive to water stress than those grown on sandy soils. Especially it was found that the CERES model underestimated the effect of water stress in high precipitation which led to overprediction of crop yield in clay soils. In order to solve these problems and successfully forecast grain yield, further studies on the modification of the water stress response of crops should be considered prior to use of the CERES-barley model for yield forecasting.

Development of an Efficient Microbial Process Using Non-edible Biomass by Engineering Vibrio sp. dhg

Sung Hwa WOO,Hyun Gyu LIM,Dong Hun KWAK,Yong Hee HAN,Sungwoo PARK,Sang Woo SEO,Gyoo Yeol JUNG 한국생물공학회 2021 한국생물공학회 학술대회 Vol.2021 No.10

Most microorganisms including industrial host strains were not able to efficiently utilize non-preferred carbon sources contained in non-edible biomass, such as alginate, xylose, and arabinose. Therefore, choosing an appropriate host strain would determine the efficiency of the entire bioprocess. In this regard, due to a broad spectrum of sugar utilization and genetic tractability of Vibrio sp. dhg, it was studied as a platform strain for the processes using non-edible biomass as a feedstock; brown-macroalgae and lignocellulose in this study. In order to efficiently utilize brown macroalgae as a feedstock, Vibrio sp. dhg capable of catabolizing alginate was isolated. After genome sequencing, genetic engineering tools were established. The production strains for ethanol, 2,3-butanediol, and lycopene demonstrated unprecedent productivities from brown macroalgae-derived carbon sources (alginate and mannitol). In order to efficiently utilize lignocellulose as a feedstock, Vibrio sp. dhg was rationally and evolutionary engineered for improved xylose catabolism and removal of carbon catabolite repression (CCR). Lactate-producing strain was constructed based on previously engineered strain and showed high productivity from lignocellulose-derived sugars (glucose, arabinose, and xylose).

Bifunctionally active and durable hierarchically porous transition metal-based hybrid electrocatalyst for rechargeable metal-air batteries

Seo, Min Ho,Park, Moon Gyu,Lee, Dong Un,Wang, Xiaolei,Ahn, Wook,Noh, Seung Hyo,Choi, Sung Mook,Cano, Zachary P.,Han, Byungchan,Chen, Zhongwei Elsevier 2018 Applied catalysis. B, Environmental Vol.239 No.-

<P><B>Abstract</B></P> <P>In this work, we show an effective strategy combining experimental and computational methods to explore and clarify rational design approaches utilizing transition metals for enhanced electrocatalysis of oxygen reactions. We report a bifunctional electrocatalyst synthesized by a chemical deposition of palladium (Pd) nanoparticles on three-dimensionally ordered mesoporous cobalt oxide (Pd@3DOM-Co<SUB>3</SUB>O<SUB>4</SUB>) demonstrating extreme stability and activity towards electrocatalytic oxygen reduction and evolution reactions (ORR and OER). Pd@3DOM-Co<SUB>3</SUB>O<SUB>4</SUB> exhibits a significantly positive-shifted ORR half-wave potential of 0.88 V (vs. RHE) and a higher OER current density of 41.3 mA cm<SUP>−2</SUP> measured at 2.0 V (vs. RHE) relative to non-deposited 3DOM-Co<SUB>3</SUB>O<SUB>4</SUB>. Moreover, in terms of durability, Pd@3DOM-Co<SUB>3</SUB>O<SUB>4</SUB> demonstrates a negligible half-wave potential loss with 99.5% retention during ORR and a high current density retention of 96.4% during OER after 1000 cycles of accelerated degradation testing (ADT). <I>Ab-initio</I> computational simulation of the oxygen reactions reveals that the modification of the electronic structure by combining Pd and Co<SUB>3</SUB>O<SUB>4</SUB> lowers the Pd d-band center and enhances the electron abundance at the Fermi level, resulting in improved kinetics and conductivity. Furthermore, it is elucidated that the enhanced electrochemical stability is attributed to an elevated carbon corrosion potential (<I>U<SUB>corr,C</SUB> </I>) for the Pd@3DOM-Co<SUB>3</SUB>O<SUB>4</SUB> surface and an increased dissolution potential (U<SUB>diss</SUB>) of Pd nanoparticles. Meanwhile, synergistic improvements in the bifunctional activity resulting from the combination of Pd and 3DOM-Co<SUB>3</SUB>O<SUB>4</SUB> were confirmed by both electrochemical and physical characterization methods, which highlights the practical viability of Pd@3DOM-Co<SUB>3</SUB>O<SUB>4</SUB> as an efficient bifunctional catalyst for rechargeable metal-air batteries.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Strategy for rational design of transition metal-based bifunctional electrocatalyst. </LI> <LI> Synergistic combination of Pd and 3DOM Co<SUB>3</SUB>O<SUB>4</SUB> for enhanced activity and durability. </LI> <LI> Doped-Pd on 3DOM Co<SUB>3</SUB>O<SUB>4</SUB> leads to electron abundance at the Fermi level. </LI> <LI> Low carbon corrosion and bulk–like dissolution tendency of doped-Pd on 3DOM Co<SUB>3</SUB>O<SUB>4</SUB>. </LI> <LI> 500 h of Zn-air battery operation with improved charge-discharge performance. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Speciation and capture performance of mercury by a hybrid filter in a coal-fired power plant

Sung, Jin-Ho,Back, Seung-Ki,Jung, Bup-Mook,Kang, Youn-Suk,Lee, Chul-Gyu,Jang, Ha-Na,Seo, Yong-Chil Elsevier 2017 International journal of coal geology Vol.170 No.-

<P><B>Abstract</B></P> <P>Mercury speciation and removal were investigated for a newly developed hybrid filter (HF) originally designed to remove fine particulates and retrofitted to the exhaust cleaning system in a coal-fired power plant. The test plant used a blend of anthracite and semi-anthracite coals for combustion. At the boiler outlet, Hg<SUP>0</SUP> was the dominant mercury species in the flue gas at 89% of total Hg. After passing through the electrostatic precipitator (ESP) and HF, Hg<SUP>2+</SUP> became the dominant species owing to oxidation of Hg at the lower temperature and interaction with other air pollutants in the flue gas. The Hg<SUP>2+</SUP> subsequently accumulated as Hg<SUB>p</SUB> by bonding with fly ash. Due to higher oxidation of Hg in the HF than in the ESP, more Hg<SUP>2+</SUP> could be removed by the flue gas desulfurization (FGD) system through dissolution of Hg<SUP>2+</SUP> when an HF was included. By installing hybrid filters alongside the existing devices, removal efficiencies of 86.7% and 99.3% for Hg and fine particulates, respectively, could be achieved, as opposed to 62.4% and 95.2% without the installation. Applying HFs in the existing air pollution control device (APCD) configuration was therefore recommended as the best simultaneous control technology for Hg and fine particulate matter (PM) at the test plant.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The prediction for the speciation behavior of gas phase mercury </LI> <LI> Mercury speciation changes with flue-gas composition. </LI> <LI> Elemental mercury oxidation and removal by Hybrid filter </LI> <LI> The suggestion of the configuration of Air Pollution Control Device for Hg removal </LI> </UL> </P>

Characterization, detection and identification of transgenic chili pepper harboring coat protein gene that enhances resistance to cucumber mosaic virus

Seo, Sang-Gyu,Kim, Ji-Seong,Jeon, Seo-Bum,Shin, Mi-Rae,Kang, Seung-Won,Lee, Gung-Pyo,Hong, Jin-Sung,Harn, Chee-Hark,Ryu, Ki-Hyun,Park, Tae-Sung,Kim, Sun-Hyung The Korean Society of Plant Biotechnology 2009 식물생명공학회지 Vol.36 No.4

Previously, two events (H15 and B20) of transgenic pepper (Capsicum annuum L.) that enhanced resistance to Cucumber mosaic virus (CMV) by the introduction of CMV coat protein (CP) gene were constructed. Presently, a single copy number of the CP gene was revealed in H15 and B20 by Southern blot. To predict possible unintended effects due to transgene insertion in an endogenous gene, we carried out sequencing of the 5'-flanking region of the CP gene and a Blastbased search. The results revealed that insertion of the transgene into genes encoding putative proteins may occur in the H15 and B20 transgenic event. Mutiplex polymerase chain reaction (PCR) for simultaneous detection and identification of transgenic pepper was conducted with a set of nine primers. Both transgenic event were differentiated from non-transgenic event by the presence of 267 bp and 430 bp PCR products indicative of CP gene specific primer pairs and primer pairs targeting the CP gene and 35S promoter. H15 and B20 uniquely possessed a 390 bp and 596 bp PCR product, respectively. The presence of a 1115 bp product corresponding to intrinsic pepper actin gene confirmed the use of pepper DNA as the PCR template. The primer set and PCR conditions used presently may allow the accurate and simple identification of CMV resistant transgenic pepper.

Control of Cathode Arc Root Behavior in a Reverse Polarity Hollow Electrode Plasma Torch Using an Exit Nozzle

Sang-Min Jeong,Darian Figuera-Michal,Dong-Hyun Lee,Min-Gyu Choi,Jun-Ho Seo 한국진공학회(ASCT) 2021 Applied Science and Convergence Technology Vol.30 No.6

In this study, a hollow electrode plasma torch with a cylindrical exit nozzle was proposed and tested to control the behavior of cathode arc roots in the reverse polarity electrical connection for the non-transferred mode operation. The test results revealed that in the absence of an exit nozzle, cathode arc roots cause arcing on the electrically floated torch housing, producing an unstable plasma jet. However, in the presence of an exit nozzle, when injecting the secondary gas with a swirl through a gap between the exit nozzle and front electrode, it was confirmed that cathode arc roots can be controlled to form only on the surface of the front electrode, producing a stable plasma jet without arcing on the torch housing. Additionally, the presence of an exit nozzle was observed to have little influence on the voltage–current characteristics of a reverse polarity hollow electrode plasma torch. Instead, heat loss to the coolant was reduced compared to that in the absence of an exit nozzle, thereby improving thermal efficiency.

Effect of Low-Cycle Fatigue on the Hot Ductility of Plain Carbon Steel

( Sang Chul Seo ),( Hyun Jung Kim ),( Byung Ho Park ),( Kwang Suk Son ),( Sung Keun Lee ),( Sun Bae Kang ),( Dong Gyu Kim ) 대한금속재료학회 ( 구 대한금속학회 ) 2006 METALS AND MATERIALS International Vol.12 No.3

In a continuous casting steelmaking operation, the surface of a slab is under a condition that can be characterized as high-temperature, low-cycle fatigue in which the tensile and compressive stress is repeatedly developed. For this reason, for the evaluation of the hot ductility of a slab, considering the fatigue deformation is more feasible before a tensile or compressive test. In this study, the effects of low-cycle fatigue on the hot ductility of steels with a carbon content of 0.06-0.8 wt.% are investigated at various temperatures. For a carbon content of 0.06 %, there were no significant differences between the RA values from a simple tensile test and those from a tensile test after fatigue deformation. The tendency of ductility deterioration with fatigue deformation is evident in 0.1 %C steel, and is due to the deformation-induced ferrite film that forms around the prior austenite grain. Conversely, high carbon steel containing 0.8 %C did not show a recovery of hot ductility in a low temperature region, and the specimen on which the tensile was measured after fatigue showed a higher hot ductility in the low temperature region, which is thought to result from the pearlite refinement effects. As the results obtained in this work showed noticeable differences in the hot ductility of carbon steel through the test conditions, it is suggested that for more accurate data, fatigue deformation be adopted in which the temperature range in an unbending operation is determined in the steelmaking factory.

The Incidence and Risk Factors of Steroid-induced Diabetes in Patients with Respiratory Diseases (초)

Seo Yun Kim,Chul Gyu Yoo,Chun Taeg Lee,Hee Soon Chung,Young Whan Kim,Sung Koo Han,Young Soo Shim,Jae Joon Yim 대한결핵 및 호흡기학회 2010 대한결핵 및 호흡기학회 추계학술대회 초록집 Vol.110 No.-